Copper Alloy C81700-TB00
Heat-treated state
UNS C81700 · ASTM B824
TB00 = solution heat treated
Pick when heavy machining, straightening or forming is done before the customer performs the precipitation age.
Values for the TB00 condition
Other C81700 tempers and conditions
C81700 is listed in 3 conditions; see the grade overview at C81700.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TB00This page Solution heat treated | Pick when heavy machining, straightening or forming is done before the customer performs the precipitation age. | 125 | 330 | 25 | 70 HB | 25 % IACS |
Thermomechanically controlled processed | Pick for low-stress, dimensionally stable parts or when the casting will be heat treated later by the user. | 140 | 310 | 20 | 75 HB | 30 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition: full strength, hardness and ~45 % IACS conductivity for tooling, electrodes and bushings. | 515 | 655 | 5 | 20 HRC | 45 % IACS |
What is C81700-TB00?
C81700-TB00 is C81700 heat treated to TB00 — pick when heavy machining, straightening or forming is done before the customer performs the precipitation age. C81700-TB00 has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 130 GPa (18.9 Msi). C81700-TB00 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 1,030°C (1,886 °F). TF00 is the default condition FabDigit quotes; TB00 is available on request or by drawing note.
Advantages
- Stiff — 130 GPa (18.9 Msi), better than 89% of copper alloy grades
Limitations
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
- Low strength — 125 MPa (18.1 ksi), worse than 77% of copper alloy grades
C81700-TB00 properties
Typical room-temperature values for C81700-TB00; 10 are specific to this condition. Other listed values are C81700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C81700-TB00 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical12
C81700-TB00 has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 130 GPa (18.9 Msi).
Thermal6
C81700-TB00 is rated for continuous service to 200°C (392 °F). It conducts heat at 120 W/m·K (69.3 BTU/hr·ft·°F), better than 66% of copper alloy grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
C81700-TB00 conducts electricity at 25 % IACS, better than 59% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C81700-TB00 takes about 70 MJ of energy and emits 4.5 kg of CO₂ — more than 84% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C81700-TB00's machinability is fair (45/100, better than 64% of copper alloy grades); weldability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C81700-TB00
Is C81700 easy to machine?
Machines like a hard bronze — carbide tooling, positive rake, flood coolant; beryllium-containing swarf and dust must be wet-collected and handled under an occupational-health programme.
Can C81700 be welded?
GTAW/GMAW with matching Cu-Be filler is possible under preheat; the heat-affected zone loses ageing response, so re-solution + re-age for full properties.
Can C81700 be formed, bent or molded?
Supplied as sand, permanent-mould or centrifugal castings with good fluidity; solution treat ~790–815 °C, water quench, then age ~480–500 °C for 2–3 h.
What surface finishes work on C81700?
Not anodisable; polishes to a bright copper finish and takes Ni/Cr or electroless-nickel plating, chemical blackening or clear lacquer for tarnish control.
C81700 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Below-beryllium level; verify against current CDA/ASTM B770 registration | 0.4 – 0.8 | 0.6 |
| CoCo (may be partly replaced by Ni) as grain refiner/hardener | 2.4 – 2.7 | 2.5 |
| Agsilver addition raises softening resistance | 0.9 – 1.1 | 1 |
| Si | ≤ 0.2 | — |
| Fe | ≤ 0.1 | — |
| Al | ≤ 0.1 | — |
| CuCu (incl. Ag) approx. 94 % min | balance | — |
C81700-TB00 — frequently asked
What is C81700-TB00 used for?
C81700-TB00 is typically used for plastic mold cores, bushings, bearing components and continuous casting dies. In short: lower-cost cast beryllium copper; wear resistance with 45 % IACS; age-hardenable cast tooling alloy.
What is the yield strength of C81700-TB00?
C81700-TB00 has a typical yield strength of 125 MPa (18.1 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 77% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C81700-TB00 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machines like a hard bronze — carbide tooling, positive rake, flood coolant; beryllium-containing swarf and dust must be wet-collected and handled under an occupational-health programme.
Can C81700-TB00 be welded?
With care — weldability is rated fair (45/100). GTAW/GMAW with matching Cu-Be filler is possible under preheat; the heat-affected zone loses ageing response, so re-solution + re-age for full properties.
What surface finishes work on C81700-TB00?
Not anodisable; polishes to a bright copper finish and takes Ni/Cr or electroless-nickel plating, chemical blackening or clear lacquer for tarnish control.
Can C81700-TB00 be formed, bent or molded?
Supplied as sand, permanent-mould or centrifugal castings with good fluidity; solution treat ~790–815 °C, water quench, then age ~480–500 °C for 2–3 h.
What is the maximum service temperature of C81700-TB00?
C81700-TB00 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C81700-TF00 and C81700-TB00?
TF00 is the default condition — standard supply condition: full strength, hardness and ~45 % IACS conductivity for tooling, electrodes and bushings. TB00: pick when heavy machining, straightening or forming is done before the customer performs the precipitation age. Yield strength is 515 MPa in TF00 versus 125 MPa in TB00.
Sources
- ASTM B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- ASTM B824 — General Requirements for Copper Alloy Castings — ASTM International (2021)
- CDA Cast Copper Alloy Datasheets (C817xx / C820xx family) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.